Converts text to QR Code using Google Charts API

qr.rb

require 'net/http'
require 'uri'

print <<INFO
QR Code Generator
Generated codes will be saved to "label.png" in the current directory
INFO

print "Text to encode: "
label_contents = gets.strip

begin
  res = Net::HTTP.post_form URI.parse('http://chart.apis.google.com/chart'), 
    { :cht => "qr", "chl" => label_contents, :chs => "200x200" }

  File.open("label.png", "w") {|f| f.write res.body}
rescue
  print "Unable to generate QR Code"
end